Mathematical language just isn't properly understood by many people. People may possibly mistakenly use "month-to-month average" when they really want the 'average every month' but that doesn't change the meaning of those conditions, just as people producing about "stationery autos" does not change the meaning of "stationery" or "stationary". https://financefeeds.com/crossover-markets-expands-to-u-s-extends-crossx-ecn-access-to-domestic-institutions/